I have eliminated the gauge and pressure sender, as the elec. boost pump reads 4.5 psi.
Checked and cleaned the gascolater and carb finger screen, no debris or blockage. Checked the archive and this seem to happen on engines that have set for over a year. Mine had set for 10 years. Lycoming suggest replacing fuel pump every 10 years. So i guess i will bite the bullet and purchase a overhauled pump. Will post the results.
RV-9A, flying 6/18/2018